Abstract: A photo-detecting device includes a first semiconductor layer with a first dopant, a light-absorbing layer, a second semiconductor layer, and a semiconductor contact layer. The second semiconductor layer is located on the first semiconductor layer and has a first region and a second region, the light absorbing layer is located between the first semiconductor layer and the second semiconductor layer and has a third region and a fourth region, the semiconductor contact layer contacts the first region. The first region includes a second dopant and a third dopant, the second region includes second dopant, and the third region includes third dopant. The semiconductor contact layer has a first thickness greater than 50 ? and smaller than 1000 ?.

Abstract: A monitoring camera including a housing, a sliding chute, an image capturing unit, an adjusting screw, and a cabin door is provided. The housing has a groove formed on one side. The sliding chute is disposed on a bottom surface of the groove. The image capturing unit is accommodated in the housing to capture images, and has an optical adjusting ring for adjusting optical properties of the image capturing unit. The adjusting screw is disposed on the sliding chute and is connected to the optical adjusting ring via a connection unit. The cabin door is pivoted to the groove, and when the cabin door is closed, a force is provided to press the adjusting screw, such that the adjusting screw is fixed on the bottom surface of the groove.

Abstract: A vandal-proof rack structure for a surveillance monitor is disclosed, which comprises: a frame, having a first gear positioned at a specific location thereof and being used for receiving the surveillance monitor; a first axial seat, having a second gear and a third gear arranged thereat while enabling the second gear to mesh with the first gear and thus enabling the frame to pitch vertically with respect to the first axial seat; and a second axial seat, having a fourth gear arranged thereon while enabling the fourth gear to mesh with the third gear and thus enabling the first axial seat to yaw horizontally with respect to the second axial seat.